Pump-jack.



S. M. GARD.

PUMP JACK.

APPLICATION mso APR.2I, 1915.

1,182,553. Patented May 9, 1916.

I/IIIIIIIIIIIIII/II SAMUEL M. GARD, OF DECATUR, ILLINOIS.

PUMP- JACK.

Specification of Letters Patent.

Patented May 9, 1916.

Application filed April 21, 1915. Serial No. 22,919.

To all whom it may concern Be it known that I, SAMUEL M. GARD, a citizen of the United States, residing at Decatur, in the county of Macon and State of Illinois, have invented certain new and useful Improvements in PumpJacks, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to pump jacks, and more particularly to an improved pump operating mechanism or gearing.

It is the primary object of the present invention to provide an operating gearing for pumps whereby a relatively long direct stroke of the pump rod may be obtained with substantially the same expenditure of power as a short stroke of the rod.

The invention has for another object to provide an operating element connected to the pump rod which is mounted for movement in a single vertical plane, and a rotatably mounted bodily oscillatable power transmitting pinion for actuating said element.

It is an additional object of the invention to produce a pump jack or operating mechanism which is of such construction that the user may very easily and quickly vary the length of stroke of the pump rod, as particular circumstances may require.

My invention has for a further general object to improve and simplify the construction of mechanisms of the above character whereby the same are rendered positive, re liable and efficient in practical operation, as well as extremely strong and durable.

With the above and other objects in view, my invention consists in the novel features of construction, combination, and arrangement of parts to be hereinafter more fully described, claimed, and illustrated in the ac companying drawing, in which,

Figure 1 is a side elevation of a pump jack, illustrating the preferred embodiment of my invention; Fig. 2 is a section taken on the line 2-2 of Fig. 1; Fig. 3 is a section taken on the line 33 of Fig. 1; and Fig. 4 is a detail perspective view of the vertically reciprocable pump rod actuating element.

Referring in detail to the drawing, 5 des-- ignates the spaced vertical uprights or standards which are bolted or otherwise rigidly secured at their lower ends to the base or platform surrounding the pump casing. Upon the upper ends of these standards, the frame structure of my improved operating ack is mounted and secured.

The pump ack frame includes spaced longitudinal bars 6 which are securely bolted, as indicated at 7, upon the standards or uprights 5. The inner faces of these bars 6 are provided with the longitudinally extend ing ribs 8 for a purpose to be later referred to. At their lower ends, the bars 6 are connected by a cross bar 9 while the upper ends thereof are connected by means of the horizontally disposed slotted guide bar 10.

11 designates a bearing member which is also secured to the lower ends of the bars 6. A shaft 12 is centrally journaled in this bearing, and upon the inner end thereof, the sprocket wheel 13 is secured, while a suitable belt Wheel indicated at 14 is fixed upon the outer end of said shaft for engagement by a driving belt 15. The pump rod actuating element 16 is in the form of a substantially rectangular metal plate which is provided in its opposite longitudinal edges with grooves 17 to receive the ribs 8 on the inner faces of the bars 6 whereby said element 16 is guided in its vertical movement. The lower end of the plate 16 is reduced in width or provided with a longitudinally extending arm, indicated at 18, which is adapted to be connected to the upper end of the pump rod 19. The plate 16 has formed upon one face, at substantially the center thereof, a series of cog or gear teeth indicated at 20, the arrangement of which is of rectangular form in plan. A continuous channel or groove 21 is formed in the face of the plate 16 surrounding this integral ear. g A vertically disposed bar 22 has its lower end pivotally mounted upon a bolt 23 fixed in the frame bar 9, while the upper end of this bar 22 is engaged in the slotted cross bar 10. Thus, the bar 22 may oscillate laterally across the face of the vertically movable plate 16. This bar is formed with a bearing hub 24 in which a shaft 25 is rotatably mounted. Upon the inner end of this shaft, the pinion 26 is fixed for meshing engage ment with the teeth of the gear 20 on the plate 16. To the outer end of the shaft 25, a relatively large sprocket wheel 27 is secured, and this wheel is connected, by means of the sprocket chain 28, to the small sprocket wheel 13 fixed upon the inner end of the shaft 12. It will be observed that the pinion 26 and the gear 20 have their teeth provided with rounded or convex edges so that all danger of binding in the movement of'the pinion around and upon the teeth of the gear 20 is obviated.

In the operation of the device, it will be understood that, when power is transmitted to the pinion 26 through the medium of the belt 15 and sprocket chain 28, said pinion meshing with the gear 20 will move the slid' ably mounted plate 16 in one direction vertically between the frame bars 6, and at the end of this stroke of the plate 16, the bar 22 will swing or oscillate laterally upon the bolt 23 across the end of the gear 20 and to the opposite side thereof, so that in the continued rotation of the pinion 26, the movement of the plate 16 is reversed. It requires no power to effect this oscillation of the bar 22, as the pinion 26 will be caused. to rotate around the end of the gear 20 by the pressure of the rotating pinion against the end tooth of the gear 20 and the pull of the chain 28. It will thus be seen that, by mounting the rotating pinion to oscillate with respect to the gear on the pump rod actuating element, there is a direct vertical stroke transmitted to the pump rod so that substantially the same power will be required for a long or short stroke of the rod. The plate 16 may be very easily and quickly removed from the frame and a new plate substituted therefor having a longer gear 20 so that a longer stroke of the pump rod can be obtained with the same lifting power. It is also apparent that, by mounting the actuating element 16 for movement in a single vertical plane, proper cooperation between the pinion 26 and the teeth of the gear 20 on the plate is, at all times, assured, so that lost motion will be practically eliminated. It is, of course, understood that the channel or groove 21 in the face of the plate 16, receives the hub extension on the gear 26, said groove serving as a guide for the oscillating movement of the pinion and, together with the limiting guide bar 10, constitutes the means whereby the teeth of said pinion are at all times maintained in proper meshing engagement with the teeth of the gear 20.

From the foregoing description, taken in connection with the accompanying drawing, the construction, manner of operation, and several advantages of my invention will be clearly and fully understood. It will be seen that I have produced a pump jack or operating mechanism which is exceedingly simple in its construction and, therefore,positive and reliable in action. By means of the relative arrangement of the several elements above set forth, a long direct stroke of the pump rod may be obtained with practically the same operating power as a short stroke. By eliminating relative lateral or pivotal movement between the actuating element 16 and the pump rod to which it is connected, there is a direct application of the lifting power to the pump rod, and lost motion and excessive Wear, due to such relative move- 1nent,is'also avoided. The device will, therefore, be extremely durable in practical operation, and will consequently require only small and infrequent repairs. I have above referred to a particular manner of mounting the ack in position for operation; but it will, of course, be apparent that the invention is not limited in its practical application to such a specific mounting thereof. The several structural features of my improved jack are also susceptible of considerable modifica tion therein, and I, therefore, reserve the privilege of resorting to all such legitimate changes as may be fairly embodied within the spirit and scope of the invention as claimed.

Having thus fully described my invention, What I desire to claim and secure by Letters Patent is A pump jack including a frame, a rectangular plate removably mounted in said frame for vertical sliding movement in a single plane and adapted to be connected to a pump rod, said plate being provided upon one side with a fixed rectangular gear, a bar pivotally mounted at one of its ends upon the frame for oscillating movement, a guide on the frame for the other end of said bar, a rotatable pinion carried by said bar for meshing engagement with said rectangular gear, a power transmission shaft mounted upon the frame, a flexible driving connection between said shaft and the pinion thereon, said pinion being moved bodily across the ends of the rectangular gear in the oscillation of said bar from one side of said gear to the other to impart a direct vertical reciprocat ing movement to said plate.

In testimony whereof I hereunto aflix my signature in the presence of two Witnesses.

SAMUEL M. GARD.

Witnesses:

CHRIS ALBERT, G. P. LEWIS.

copies of this patent may he obtained for five cents each, by addressing the "Commissioner of ramm, Washington, D. 0. 

